Readings & Meanings:
all, everything, everyone
With everyone cooperating, we finished cleaning.
I won the award for perfect attendance.
No such facts are in evidence.
I already dealt with this in the post on 階. But here is the explanation again.
比 is on the top of 皆, and we should know it from 比べる, to compare. 比 is a pictograph of two people lined up.
The bottom part of 皆 is a squished version of 自, self. It acts as an action indicator.